In trading on Monday, shares of the iShares MSCI United Kingdom Small-Cap ETF ( EWUS) entered into oversold territory, changing hands as low as $38.5501 per share. We define oversold territory using the Relative Strength Index, or RSI, which is a technical analysis indicator used to measure momentum on a scale of zero to 100. A stock is considered to be oversold if the RSI reading falls below 30.In the case of iShares MSCI United Kingdom Small-Cap, the RSI reading has hit 27.2 — by comparison, the RSI reading for the S&P 500 is currently 58.6. A bullish investor could look at EWUS's 27.2 reading as a sign that the recent heavy selling is in the process of exhausting itself, and begin to look for entry point opportunities on the buy side. Looking at a chart of one year performance (below), EWUS's low point in its 52 week range is $36.51 per share, with $45.03 as the 52 week high point — that compares with a last trade of $39.16. iShares MSCI United Kingdom Small-Cap shares are currently trading off about 2.1% on the day.